Generating 2048 Bit Rsa Keys Cisco Stuck
Nov 23, 2011 Choose the size of the key modulus in the range of 360 to 2048 for your Encryption Keys. Choosing a key modulus greater than 512 may take a few minutes. How many bits in the modulus 512: 1024% Generating 1024 bit RSA keys, keys will be non-exportable.OK% Generating 1024 bit RSA keys, keys will be non-exportable.OK router (config)#. Timing Key Generation. To dispel this myth I used two scenarios: Windows Server 2012 Active Directory Certificate Services generating a 2048-bit RSA key for a self-signed certificate. This is on a single-CPU server with 2048MB of RAM running inside VMware. OpenSSL generating a similar 2048-bit RSA key on an Intel i7 3.6Ghz with 32MB of RAM.
A host public-key pair (2048-bit RSA) is always generated during the installation of Tectia Server. You only need to regenerate it if you want to change your host key pair.
The command-line tool ssh-keygen-g3 can be used to generate the host key pair. It can be used for creating the user key pairs as well.
Before you can create your CSR, you need to create your Java keystore. Your Java keystore contains your private key. Run the following command to create your 2048 bit Java keystore: keytool -genkey -alias myalias -keyalg RSA –keysize 2048 -keystore c:yoursite.keystore 2. Note the alias you use here to. Generating a key pair. Run the ssh-keygen command to create the key pair, specifying a secure directory for storing the new file. This example involves a 2048-bit RSA key and incorporates the /tmp directory, but you should use any directory that you trust to protect the file. Ssh-keygen -t rsa -b 2048 -f /tmp/idrsa.
On Unix, to (re)generate the host key, give the following command with root privileges:
where:
-P indicates that the key has an empty passphrase
-H indicates that the key pair is stored in the default host key directory
On Windows, to (re)generate the host key, give the following command:
This will generate a 2048-bit RSA key pair (without a passphrase) and save it in the default host key directory (/etc/ssh2 on Unix, '<INSTALLDIR>SSH Tectia Server' on Windows) with the names hostkey and hostkey.pub. For more information on the key generation options, see ssh-keygen-g3(1).
After the new key pair has been created, run ssh-server-ctl to reconfigure the server. See ssh-server-ctl(8).
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The private key of the server must never be readable by anyone but |
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While Encrypting a File with a Password from the Command Line using OpenSSLis very useful in its own right, the real power of the OpenSSL library is itsability to support the use of public key cryptograph for encrypting orvalidating data in an unattended manner (where the password is not required toencrypt) is done with public keys.
The Commands to Run
Generate a 2048 bit RSA Key
You can generate a public and private RSA key pair like this:
openssl genrsa -des3 -out private.pem 2048
That generates a 2048-bit RSA key pair, encrypts them with a password you provideand writes them to a file. You need to next extract the public key file. You willuse this, for instance, on your web server to encrypt content so that it canonly be read with the private key.
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Export the RSA Public Key to a File
This is a command that is
openssl rsa -in private.pem -outform PEM -pubout -out public.pem
The -pubout flag is really important. Be sure to include it.
Next open the public.pem and ensure that it starts with-----BEGIN PUBLIC KEY-----. This is how you know that this file is thepublic key of the pair and not a private key.
To check the file from the command line you can use the less command, like this:
less public.pem
Do Not Run This, it Exports the Private Key
A previous version of the post gave this example in error.
openssl rsa -in private.pem -out private_unencrypted.pem -outform PEM
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The error is that the -pubout was dropped from the end of the command.That changes the meaning of the command from that of exporting the public keyto exporting the private key outside of its encrypted wrapper. Inspecting theoutput file, in this case private_unencrypted.pem clearly shows that the keyis a RSA private key as it starts with -----BEGIN RSA PRIVATE KEY-----.
Visually Inspect Your Key Files
It is important to visually inspect you private and public key files to makesure that they are what you expect. OpenSSL will clearly explain the nature ofthe key block with a -----BEGIN RSA PRIVATE KEY----- or -----BEGIN PUBLIC KEY-----.
You can use less to inspect each of your two files in turn:
less private.pemto verify that it starts with a-----BEGIN RSA PRIVATE KEY-----less public.pemto verify that it starts with a-----BEGIN PUBLIC KEY-----
The next section shows a full example of what each key file should look like.
The Generated Key Files
The generated files are base64-encoded encryption keys in plain text format.If you select a password for your private key, its file will be encrypted withyour password. Be sure to remember this password or the key pair becomes useless.
The private.pem file looks something like this:
The public key, public.pem, file looks like:
Protecting Your Keys
Depending on the nature of the information you will protect, it’s important tokeep the private key backed up and secret. The public key can be distributedanywhere or embedded in your web application scripts, such as in your PHP,Ruby, or other scripts. Again, backup your keys!
Remember, if the key goes away the data encrypted to it is gone. Keeping aprinted copy of the key material in a sealed envelope in a bank safety depositbox is a good way to protect important keys against loss due to fire or harddrive failure.
Oh, and one last thing.
If you, dear reader, were planning any funny business with the private key that I have just published here. Know that they were made especially for this series of blog posts. I do not use them for anything else.
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Generating 2048 Bit Rsa Keys Cisco Stuck Windows 10
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